新颖十二面体钛酸钡纳米晶体的水热生长机理
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摘要
本研究采用水热法,利用表面活性剂聚乙二醇200(PEG200)合成具有12个(110)晶面的新颖十二面体钛酸钡纳米晶体。采用X射线衍射(XRD)、扫描电子显微镜(SEM)分析了钛酸钡纳米颗粒的水热生长结构特点:在反应初始阶段,强碱性条件下,前驱体TiO_2颗粒表面发生溶解沉淀的过程,迅速生成BaTiO_3晶核;该纳米晶核在PEG200的作用下,发生溶解沉淀的再生长过程,最后长大为十二面体BaTiO_3纳米晶体。Johnson-Mehl-Avrami (JMA)方程动力学模拟结果表明:晶体的成核是控制步骤,晶体的生长符合"溶解-沉淀"的机理。这种表面活性剂调控下的"溶解-沉淀"形成过程,揭示了以TiO_2颗粒为前驱体形成十二面体钛酸钡纳米晶体的生长机理。
In this study, using the surfactant PEG200, a novel dodecahedral nanocrystals of barium titanate with twelve(110) crystal surfaces were synthesized by hydrothermal method. The growth and structural characteristics of barium titanate nanoparticles under the hydrothermal conditions were analyzed by X-ray diffraction(XRD) and scanning electron microscope(SEM): In the initial stage of the reaction, under the strong alkaline condition, the surface of the precursor TiO_2 particles was dissolved and BaTiO_3 nucleation was produced rapidly; Under the action of PEG200, the crystal nucleus of BaTiO_3 regrew through the process of dissolution and precipitation, and finally grew into the dodecahedral nanocrystals. Using Johnson-Mehl-Avrami(JMA) equation, the kinetic simulation results show that the crystal nucleation is a control step, and the crystal growth is governed by the mechanism of "solution-precipitation". It is revealed that the growth mechanism of barium titanate dodecahedral nanocrystals using TiO_2 particles as the precursor is the formation process of "solution-precipitation" under the surfactant control.
In this study, using the surfactant PEG200, a novel dodecahedral nanocrystals of barium titanate with twelve(110) crystal surfaces were synthesized by hydrothermal method. The growth and structural characteristics of barium titanate nanoparticles under the hydrothermal conditions were analyzed by X-ray diffraction(XRD) and scanning electron microscope(SEM): In the initial stage of the reaction, under the strong alkaline condition, the surface of the precursor TiO_2 particles was dissolved and BaTiO_3 nucleation was produced rapidly; Under the action of PEG200, the crystal nucleus of BaTiO_3 regrew through the process of dissolution and precipitation, and finally grew into the dodecahedral nanocrystals. Using Johnson-Mehl-Avrami(JMA) equation, the kinetic simulation results show that the crystal nucleation is a control step, and the crystal growth is governed by the mechanism of "solution-precipitation". It is revealed that the growth mechanism of barium titanate dodecahedral nanocrystals using TiO_2 particles as the precursor is the formation process of "solution-precipitation" under the surfactant control.
引文
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